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When a mosquito bites they inject some of their saliva into you. Their saliva contains a chemical that prevents the blood from clotting while they are drinking. The itching is an allergic reaction to the saliva. That is why it affects different people differently.
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoBecause the host's immunitary system attacks substances contained in the mosquito's saliva, releasing histamine, which causes ithc.
Wiki User
∙ 14y agoIts an immune response to the mosquitoes saliva.
The saliva is used to stop blood from clotting and prevent hemostasis
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